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Asterisk IAX2 Channel Driver Denial of Service

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Release Date:  2007-07-30    Last Update:  2007-07-31    Views:  12,468

Secunia Advisory SA26274

Where:

From local network

Impact:

DoS

Solution Status:

Vendor Patch

CVE Reference(s):

Description


A vulnerability has been reported in Asterisk, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to the IAX2 Channel Driver improperly processing "NEW" packets. This can be exploited to allocate resources that are never freed by sending multiple "NEW" packets for valid extensions to the server.

Successful exploitation results in a DoS, but requires that the IAX2 Channel Driver is configured to allow unauthenticated calls.

The vulnerability is reported in the following products:
Asterisk Open Source 1.2.x version 1.2.20, 1.2.21, 1.2.21.1, and 1.2.22
Asterisk Open Source 1.4.x version 1.4.5, 1.4.7, 1.4.7.1 and 1.4.8
AsteriskNOW pre-release version beta6
Asterisk Appliance Developer Kit 0.5.0
s800i versions 1.0.0-beta5 to 1.0.2.


Solution:
Asterisk Open Source 1.2.x:

Further details available to Secunia VIM customers

Provided and/or discovered by:
Russel Bryant

Original Advisory:
http://ftp.digium.com/pub/asa/ASA-2007-018.pdf

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Asterisk IAX2 Channel Driver Denial of Service

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